This is the 3186th most frequent Polish word.
rynkach
The Polish word "rynkach" means "markets" in the locative or instrumental case.
'Rynkach' is used here as the plural locative form of 'rynek', meaning 'markets', to indicate the location of the activity.
Wielu ludzi handluje na rynkach w mieście.
Many people trade at markets in the city.
Here, 'rynkach' is also the plural locative form of 'rynek', referring to the place where fresh produce is available.
Na rynkach można znaleźć świeże owoce i warzywa.
At markets, you can find fresh fruits and vegetables.
In this sentence, 'rynkach' indicates the locative case, specifying the setting where prices are being compared.